Maciej Gracjan Zakościelny (born 7 May 1980, in Stalowa Wola) is a Polish film, television and theatre actor.
He was born on 7 May 1980 in Stalowa Wola. In 2004, he began his studies at the National Academy of Dramatic Art in Warsaw but didn't complete them. He began his acting career by appearing on TV series such as Plebania, Sfora, Na Jelenia, Samo życie and Na dobre i na złe. He played his first major film role in Jerzy Hoffman's 2003 film An Ancient Tale: When the Sun Was a God. In 2004, he started performing at the Współczesny Theatre in Warsaw and joined the cast of the popular TV crime drama Kryminalni playing the character of Marek Brodecki. He appeared in two Ryszard Zatorski movies: Tylko mnie kochaj (Just Love Me) (2005) and Dlaczego Nie (Why Not?) (2007). He also provided his voice of the title character in the Polish dub of the 2007 movie Eragon. Between 2008 and 2014, he starred in the historical television series Czas honoru playing the role of Bronek Woyciechowski, one of the Silent Unseens. Between 2017 and 2019, he played a role in the Diagnoza (Diagnosis) TV show, which earned him a nomination for the Telekamera Award for Best Actor.